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The throttle plate held open when it should close, so the engine takes in more air than commanded. It is the safety-relevant direction of a stuck throttle and the module treats it accordingly — a plate that will not return means airflow the driver did not request, so a reduced-power mode follows immediately.

Idle is where it shows. The module commands the plate closed for idle, sees the plate report a larger opening, and cannot bring engine speed down — so the complaint is a high idle that will not settle, together with a throttle actuator or airflow code. A high idle that persists with the pedal untouched is the signature.

Carbon and mechanical obstruction are the causes, in that order. Deposits build around the plate's edge exactly where it seats at idle, and a foreign object, a broken return spring or a distorted plate account for the rest. Check the plate closes fully and freely by hand with the throttle body off — this must never be diagnosed by driving the vehicle, because an uncommanded opening is a genuine hazard.